Speedometer.



d: $PEEDOMETER.

APPLICATION FILED JUNE 23, 1908.

Patented June 21, 1910.

-[rzvemfarv D. M. BELL.

SPEEDOMETEB.

APPLIGATION FILED JUNE 23, 1908.

Patented June 21, 1910.

DILLWYN ran snapper arena @Fhlfil M. BELL, 01? OAK PARK, ILLINOIS, ASSIGNOR TO THE BASTIAN-BLESSING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SPEED OME'I'ER.

Specification of Letters Patent.

Application filed June 23, 1908 Serial No. 439,92?

l tented June 2.1., into.

To all whom it may concern:

Be it known that I, DILLWYN M. BELL, a citizen of the United States, residing at Oak Park, in the county of Cook and State of 'Illinois, have invented certain new; and usewhich a clock mechanism is combined with a mechanism driven by a moving element the speed of which it is desired to measure and indicate.

The purposes and advantages of my invention will be understood from the following specification and claims taken in connection with the accompanying drawings, in which Figure l is an axial section of one embodimerit of my invention. Fig. 2 is a face View of the device. Figs. 3, 4, 5, 6 and 7 are sectionstaken on the correspondingly numbered lines looking in the directions of the rcspcctive arrows.

In the particular embodiment of my invention which I have chosen to illustrate and describe in this specification, l have shown the device as comprised within a casing having flanges 16 by which it may be readily secured to an automobile dash-board.

The sleeve 17 formed integrally with. the catsing wall forms a journal for the shaft 18 which is driven by the part the speed of which is to be measured. This shaft 18 has a collar 20 within the casing 15 and resting upon the washer 19. Beyond the collar 20 there is attached a sector 21, which will be more fully described later.

A glass plate 22 closes the front face of the casingl lfi, being held in place by the scrcwthreaded flanged ring 23; On the ledge 2% in the casing wall rests a dial-plate 26,

spaced from the glass plate 22 by the ring 25. The pointer 27 1s fixed to the stem 28 which is mounted in a journal in the center .of the dial-plate 26. Also fixed to the stem.

28 on the opposite side of the dial-plate 26 from the pointer 27 is the arm 29. A leafspring 30 is also secured by the nut 31 to the stem 28, and the end 01 this leaf-spring presses against the inner face of the dial. The arm 29 carries two lugs 32- and 33, the

purpose of which will be explained subsequently. Ashort rotatable shaft 34 passes through the sector 21 carrying an arm 35 fixed to its upper end and an arm 41 fixed to its lower end.

As shown in Fig. 41, a leaf-spring 36 hav portion of the bent up part 39 is bevcleo is indicated by the reference numeral 40. The

end of the arm et-l carries a stud A stud 48 is affixed to the under face of the sector 21. r

lVithin the bottom oi? the casing 15 is an inner casing 44 which. contains a clockspring; 4-5 having its outer end aliixcd to the casing 44 audits-inner end secured togthc slecre 46 which carries the sector urn-1 47. Vithin the sleeve 46 is another slaes'e 48 which carries a flange 49 and gear-wheel 50. Between the two sleeves 46 and 48 are the elements of a one-Way friction]clutch. Recesses 51 in the inner enemas are occupied by the rollers which arehchl toward the ends of the respective recessc by means of the coil-springshfil. The gear wheel 50 can gages a small'ge'anpinion 5 which in turn actuates a simple clock escapemeut mechanism no.

The sector it carries on its upper face the two studs 56 and 57. A short shaft 58 passes through the sector 4-7 carrying an arm 59 on the upper side and an arm 63 on the lower side. These arms 59 and (i3 terminate respectively in the lugs (30 and 64. A leafspring 31 held at the point'tSQ on the sector 4%? acts against the arm. 5!). A lug 65 pro jects from the inner face of the casing wall 15 so as to be in a position to co-act with the lap; 64.

The 21 is rotated in a clockwise direction with a speed proportional to the speed which it is desired to measure. On the other hand the arm a? is rotated in a counterclockwise direction by the-spring t?) acting through the clutch elements 52. As will more fully appear hereinafter, this movement of the arm 47 is intermittent. "Whatevcr the position of the arm 29 (and the pointer 27) one or the other of the lugs 32, will be caught b the respective lug 39 on the sector 21 or t 1e stud on the sector on the sector 2l,-then rotated so as to swing the hook or lu 39 aside, thus permitting the sector 21 to keep . on its way leaving the arm 29 behind it;

i ments 52, ment 55.- movement of The friction of the spring 30 will serve to keep the arm 29 in the position where it is left. The conjunction of the -respective projections 57 and 42 from the respective sectors 47 and 21 occurs a moment before the lugs 32 and 33 on the arm 29 are engaged by the projections 39 and 56 from the respective sectors 21 and 47. It is obvious that the sectors 21 and 47 would look against each other at this time were it not that the hook 39 is displaced as has just been described. Immediately after the hook 39 has been displaced, the stud 43 on the sector 21 strikes the hook 60 on the sector 47, and thus the sector 21 in the course of its further rotation carries the sector 47 backward with it. The two sectors 21 and 47 continue thus to move together until the lug 64 strikes the projection 65 thus displacing the hook 60. Thereupon, the sector21 continues its movement in a clockwise direction while the sector 47 commencesv its movement in a counter-clockwise direction. The sector 21 moves with speed proportional with that to v be measured;

the sector 47 moves with a uniform constant speed determined by the clock mechanism 55. Starting thus in opposite .directions from the releasing stud 65, it is obvious that point determined by thespeed of rotation of the sector 21; As has been explained, unless the pointer 21-27 is in the exact position of meeting point, it will be moved to that osition and in any case it will be left t ere. The movement of the sector 21 is a continuous rotary movement while that of the sector 47, is oscillatory. In one direction the movement of the sector 47 is due to the spring 45 and timed by .the clock escape In the opposite direction the the sector 47 is due to the interlocking ofthe same with the sector 21. This backward movement obviously restores the spring 45, but a mechanism 55,

does not afiect the clock the clutch elements 52 serving .to prevent transmission of the 'backward rotation of the collar 46 to the collar 48. r

A little consideration. will show'thatthe indications'on the dialinustzbe crowded together for higher speeds, inasmuch as no speed however great could carry the speed sector 21 quite one complete revolution u'htil it would meet the time sector 47. I so prothey will meet again at aacting through the clutch ele- Mable Speed driven speed will be indicated bya sweep of the pointer 27 over half the circumference of the dial. In Fig 2 such half sweep of the pointer is made to indicate a speed of thirty miles an hour;

While I have shown my invention in a particular form adapted for use with an automobile, I desire to state that its principle is not" limited to the embodiment here disclosed but is obviously much broader.

I claim:

1. In a device of the class described th v combination of a clock driven element ada t:- ed to travel at a constant speed in one rection, a variable speed driven element adapted to travel at a variable speed in a counter direction, and means adapted to be actuated by either of said driven elements and when so actuated to be released by the other element for indicating the speed of the variable speed element.

2. In a. device of the class described,a dial, a pointer, a clock driven element adapts ed to move the pointer in one direction, a'

variable speed element adapted tomove the pointer in the opposite direction,

to release the pointer at a position detoxand means mined by the meeting of the two said as ments.

3. In a device of the class described, a

dial, a pointer, a clock driven arm adapted to move the pointer in one direction, a variable speed driven arm ada ted to move the pointer in an opposite irection, and means to release the pointer when the said arms meet.

4. In adevice of'the class described, a dial, a pointer, a clock driven arm adapted tomove the pointer in one direction, a variable speed driven arm adapted to move the pointer in an opposite direction, means to release the pointer when the said arms meet, and means controlled by the variable speed driven arm to engage the other-arm and restore it.

5. In a device of the class described, a dial, a pointer, a clock driven arm adapted to move the pointer in one direction, a vaarm adapted to move the pointer in an opposite direction, means to release the pointer when the said arms meet, means controlled by the variable speed driven arm to engage the other arm an restore it, and means to release the restored arm'at a fixed point.

6. In a'device of dial,-a pointer, a clock driven arm adapted to move the pointer in one direction, ajyariable speed driven arm adapted to move the pointer in an .opposite direction, means arms.

the class described til I screen 7. In a device of the class described, a dial, a pointer, a clock driven arm with a stud adapted to engage the pointer, a variable speed arm with a' pivoted member adapted to engage the pointer, and a stud on the first named arm adapted to displace said pivoted member,

8. In a device of the class described, a dial, a pointer, a clock driven arm having a pivoted member thereon, a variable speed arm with a stud thereon adapted to engage said pivoted member, and a fixed stud adapted to displace said pivoted member and release it from engagement with the Stud on the variable speed arm.

9. In a device of the class described, a dial, a pointer, a rotatable arm, a clock spring for driving said arm, ment mechanism adapted to be drlven by said spring through a oneway clutch to regulate the speed of rotation of said arm, a variable speed arm, means inde endent of the clock for driving arm, and means to register the relation of said arms.

10. In a device of the class described, the combination of a clock driven element, a variable speed driven element and means adapted to be engaged by either one of said a clock escapeposite direction,

be engaged by either one of said driven ele ments and when so engaged to be released from such engagement by the other driven element for indicating the speed of the variable speed element.

12. In a device of the class described, the combination of a clock driven element adapted to travel in one direction, a variable speed driven element adapted to travel in the opand means adapted to be engaged and moved by either element and Whenso engaged to be releasedwhen the elements assume a predetermined relative position, for indicating the speed of the vasaid variab 8 speed riable speed element.

In testimony whereof, I have subscribed my name.

DILLVVYN M. BELL. Witnesses:

ANNA L. Savors, LILLIAN A. Kinny. 

